Green’s Dictionary of Slang

swan n.

(US) a swan-dive.

1987
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[US]R. Campbell Alice in La-La Land (1999) 18: ‘Anybody ever do a swan?’ she asked.

In compounds

swan-hopping (n.) [in SE, a var. of swan-upping thus ? early play on up v. (3)]

adulterous or casual sexual intercourse.

1683
1683168416851686
1687
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[UK]Fifteen Real Comforts of Matrimony 95: You ha’ been to visit the Taylors Wife, I see by your hang-dog countenance […] I’le spoil your swan-hopping.
J. Phillips [trans.] Cervantes Don Quixote 52: [H]e was as lecherous as a Mackerel, and would never be ty’d to any certain Mistress [...] I know very well he lov’d a pretty Girl in a Corner; but if he told the same Tale to all that he met, ‘twas out of a natural proneness which he had to Swan hopping, which he cou’d not well govern.